<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*子孙后代选择器*/
        /*body div div p{color: red}*/
        /*子元素选择器*/
        body>div>div>p{color: blue}
    </style>
</head>
<body>
    <p>p1</p>
    <div>
        <p>p2</p>
    </div>
    <div>
        <div>
            <p>p3</p>
        </div>
        <div>
            <div>
                <p>p4</p>
            </div>
        </div>
    </div>
</body>
</html>